CVE-2020-10204 Overview
CVE-2020-10204 is a Remote Code Execution (RCE) vulnerability affecting Sonatype Nexus Repository Manager versions prior to 3.21.2. This vulnerability allows authenticated attackers with administrative privileges to execute arbitrary code on the underlying server through improper input validation. Sonatype Nexus Repository is widely used as an artifact repository manager in enterprise DevOps environments, making this vulnerability particularly concerning for organizations relying on it for software supply chain management.
Critical Impact
Authenticated attackers with high privileges can achieve complete system compromise through remote code execution, potentially gaining full control over the Nexus Repository server and any artifacts it manages.
Affected Products
- Sonatype Nexus Repository Manager versions prior to 3.21.2
- All Sonatype Nexus installations matching cpe:2.3:a:sonatype:nexus:*:*:*:*:*:*:*:*
Discovery Timeline
- 2020-04-01 - CVE-2020-10204 published to NVD
- 2024-11-21 - Last updated in NVD database
Technical Details for CVE-2020-10204
Vulnerability Analysis
This vulnerability is rooted in improper input validation (CWE-20) within the Sonatype Nexus Repository Manager application. The flaw allows authenticated users with administrative privileges to craft malicious requests that bypass input sanitization controls, ultimately enabling arbitrary code execution on the server hosting the Nexus Repository instance.
The attack is network-accessible, meaning an attacker can exploit this vulnerability remotely without any user interaction. While the vulnerability requires high-level privileges to exploit, successful exploitation results in complete compromise of the confidentiality, integrity, and availability of the affected system.
Root Cause
The root cause of CVE-2020-10204 is improper input validation (CWE-20). The Nexus Repository Manager fails to properly sanitize or validate user-supplied input in certain administrative functions. This allows specially crafted payloads to be processed by the application in unintended ways, leading to code execution in the context of the Nexus Repository process.
Attack Vector
The attack vector for this vulnerability is network-based. An authenticated attacker with administrative access to the Nexus Repository Manager web interface can submit malicious input through administrative functions. The application processes this input without adequate validation, allowing the attacker to inject and execute arbitrary code on the server.
The vulnerability requires authentication and elevated privileges, which limits the pool of potential attackers. However, in environments where administrative credentials have been compromised or where insider threats exist, this vulnerability poses a significant risk. Once exploited, an attacker could execute commands with the privileges of the Nexus Repository process, potentially leading to data exfiltration, malware deployment, or lateral movement within the network.
Detection Methods for CVE-2020-10204
Indicators of Compromise
- Unexpected process spawning from the Nexus Repository Java process
- Unusual outbound network connections from the Nexus server
- Anomalous administrative API calls or configuration changes in Nexus audit logs
- Presence of unauthorized files or scripts in Nexus installation directories
Detection Strategies
- Monitor Nexus Repository audit logs for suspicious administrative actions
- Implement network monitoring for unexpected outbound connections from Nexus servers
- Deploy endpoint detection and response (EDR) solutions to detect anomalous process behavior
- Review authentication logs for unauthorized or unusual administrative access patterns
Monitoring Recommendations
- Enable verbose logging on Nexus Repository Manager instances
- Configure SIEM alerts for administrative actions on Nexus servers
- Implement file integrity monitoring on Nexus installation directories
- Monitor for unusual resource consumption patterns that may indicate code execution
How to Mitigate CVE-2020-10204
Immediate Actions Required
- Upgrade Sonatype Nexus Repository Manager to version 3.21.2 or later immediately
- Review and restrict administrative access to only essential personnel
- Audit administrative account credentials and enforce strong password policies
- Implement network segmentation to limit access to Nexus administrative interfaces
Patch Information
Sonatype has released version 3.21.2 of Nexus Repository Manager to address this vulnerability. Organizations should upgrade to this version or later as soon as possible. Detailed patch information and upgrade instructions are available in the Sonatype Support Article.
Workarounds
- Restrict network access to the Nexus Repository administrative interface using firewall rules
- Implement multi-factor authentication for administrative accounts where possible
- Limit the number of users with administrative privileges to reduce attack surface
- Deploy a web application firewall (WAF) to filter potentially malicious requests
# Example: Restrict access to Nexus admin interface via iptables
# Allow only trusted IP addresses to access the Nexus admin port
iptables -A INPUT -p tcp --dport 8081 -s 192.168.1.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 8081 -j DROP
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
